Air compressor crank case



FIG. 1 is a perspective view of an air compressor crank case showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof,

FIG. 4 is a left side elevational view thereof,

FIG. 5 is a right side elevational view thereof,

FIG. 6 is a top plan view thereof; and

FIG. 7 is a bottom plan view to that shown; and,

FIG. 8 is a perspective view of an air compressor crank case, the broken lines shown are for illustrative purposes only and from no part of the claimed design. 

The ornamental design for an air compressor crank case, as shown and described. 